dicus had small white spot on it yesterday,use melafix and last night large discus has eye cloud,tested water today ph 6.2,nitrite 0,nitrate 10.0,ammonia between 4.to8.,temp 82,tank 46 gal and it up 8 weeks eheim pro 2026 filter,underground filter with 2 power heads hagen 301,change 10 gal water...